Suspension insulator with hood and deformable pivoting system forming an articulatedjoint



Jan. 24, 1928.

A. RICHARD SUSPENSION INSULATOR WITH HOOD AND DEFORMABLE PIVOTING SYSTEM FORMING AN ARTICULATED JOINT Filed April 9, 1923 Patented Jan. 24', 1928.

UNITED STATES AUGUSTO RICHARD, OF MILAN, ITALY.

SUSPENSION INSULATOR WITH HOOD AND DEFORMA'BLE PIVO'IING SYSTEM FORMING AN ARTICULATED JOINT.

Application filed April 9, 1923, Serial No. 630,998, and in Italy November 15, 1922.

Many 01 the breakages of suspension insulators oi the old type, having cemented frameworks, are to-day ascribed to mechanical causes, and particularly to the strains set up in the porcelain by unequal expansion of the various n1aterialsmetal parts, cement, porcelain etc.\vhich are connected together, such expansion being caused by variations of temperature.

The cemented pivot is the most serious cause of breakages, both on account of its expansion inside the porcelain and the contract-ion of the porcelain against it.

It has been thought that possible breakages, which originate at that point, would be eliminated were the pivot elastic, and it has been thought to design such apivot by giving it the shape of a tube having longitudinal slots in the parts serving for cementing purposes (part 1 of the enclosed drawing), and compensating its deformation by means of an internal plug (part 2 of the abovesaid drawing) of paraitined wood, cork, a metal spiral or other material thought to be more suit-able for this purpose.

Other characteristics of the tubular pivot 1 are:

1. One end has a flat edge, normal to the axis, for the transmission of the tensional stress without bringing into play transversal components; bet-ween said edge and the cement, on the sustaining edge, there is a metal washer 4, in order to avoid that the cement should crumble away owing to transversal movements of the pivoting system 1.

2. The other end of the abovesaid pivoting system 1- has the shape of a semispherical concave calot-te. which internally forms the seating for the head of a supporting knob 3 having a spherical bearing surface, thus forming a connection for the spherical-shaped elements, stronger than the usual type, seeing that said knob can be passed into the tubular pivotingsystem before cementing, so that it is not necessary that the calotte have a slot in the side for the knob to enter through.

3. In the longitudinal slots in the pivot mg system 1 strips of cardboard or of other suitable material may be placed, thus radially dividing up the cement, so that the latter also may expand and contract, if necessary.

In order to increase the coherence between the cementing material and the various organs, it will be convenient to sand the surfaces rendering the same somewhat rough.

The abovesaid knob is screwed into the hood 5 of the element hanging underneath.

Having now described my invention and how the same is to be carried out, what I claim as my invention is 1. Aninsulator comprising a pair of bod ies arranged one above the other, the lower body having a connecting knob at its upper end, the upper body having a central recess in its under side, an elastically deformable tube fitted in said recess, having longitudinal slots and in the lower portion of which tube said knob is seated, the lower end of the tube being reduced to bear under the knob and afford pivotal movement to the knob and hence also to the lower member, and a plug in and detachable from said tube and bearing on said knob.

2, An insulator comprising a pair of bodies arranged one above the other, the lower body having a connecting knob at its upper end, the upper body having a central recess in its under side, an elastically deformable tube fitted in said recess, having longitudinal slots and in the lower portion of which tube said knob is seated, the lower end of the tube being reduced to bear under the knob and aiiord pivotal movement to the knob and hence also to the lower member, and a plug in and detachable from said tube and bearing on said knob, said tube having an outstanding flange at its upper end and said upper body having supporting means in its recess on which said flange bears.

In testimony whereof I afiix my signature.

AUGUSTO RICHARD. 

